L64704 LSI Logic Corporation, L64704 Datasheet - Page 26

• Manufacturer Part Number: L64704
• Description: Satellite Decoder Technical Manual 5/97
• Manufacturer: LSI Logic Corporation

2.3
Channel Data
Output Interface
2-4
The Channel Data Output Interface is the output path from the L64704.
It is typically connected to the input of the Transport Demultiplexer in a
set-top decoder application. The Channel Data Output Interface is dis-
cussed in
BCLKOUT
CO[7:0]
COE
DVALIDOUT
ERROROUT
L64704 Signal Definitions
Section 4.3, “Channel Data Output Interface.”
Byte Clock Out
The BCLKOUT output signal is a strobe that indicates
valid data bytes on the CO[7:0] bus when the L64704 is
in Parallel Channel Output mode. The BCLKOUT signal
cycles once per every valid output data byte and is used
by the Transport Demultiplexer to latch output data from
the L64704 at the BCLKOUT rate (rather than at the
OCLK rate). BCLKOUT must be disregarded in Serial
Channel Output mode.
Channel Data Out
These signals form the decoded output data port. In Par-
allel Channel Output mode (OF = 1, Group 4, APR 12)
the L64704 outputs the channel data as 8-bit wide paral-
lel data on CO[7:0]. In Serial Channel Output mode
(OF = 0) the L64704 outputs the channel data as serial
data on CO0. It is latched on every byte or bit clock cycle.
The chronological ordering in Serial Channel output
mode is MSB oldest, LSB newest.
Channel Output Enable
When asserted, COE enables the CO[7:0], ERROROUT,
and FSTARTOUT pins. DVALIDOUT is unaffected by the
COE pin and operation of the decoder continues
regardless of the state of this pin.
Valid Data Out
DVALIDOUT indicates that CO[7:0] contains the cor-
rected channel data. New data is valid on the output
when DVALIDOUT is HIGH. DVALIDOUT is not asserted
during the propagated check and GAP bytes. This pin is
set LOW after the FEC_RST register bit (Group 4, APR
36) is asserted.
Error Detection Flag
The L64704 asserts the ERROROUT pin to flag uncor-
rectable errors. The L64704 asserts the ERROROUT
signal at the beginning of any frame that contains an
uncorrectable error, and deasserts it at the end of the
Output
Output
Output
Output
Input